Rotary harrow.



PATENTED APR. 17, 1906d 0. SMITH. ROTARY HARROVV. APPLIOATIQN F1 LED AUG.26.1905

NO 818,307. PATENTED APR. l17, 1906.

0. SMITH. ROTARY HARROW. APPLICATION FILED AUG. ze. 1905.

2 SHEETS-SHEET 2.

l M W6 I Offida@ fiar/'lizza narran salaries SOTA, ASSIGNOR OF ONE-HALF TO ANOKA. MINNESOTA.

ROTARY HARHOW.

Specification of Letters Patent.

Patented April 17, 1906.

Application tiled August 26, 1905. Serial NoY 275,950.

To all who/1t it may concern,.-

Be it known that I, ORisoN SMITH, a citizen of the United States, residing at Anoka, in the county of Anoka and State of Minnesota, have invented new and useful Improvements in Rotary I'Iarrows, of which the following is a specification,

This invention relates to improvements in rotary harrows; and its prime object is to provide a strong, durable, and economical structure to withstand the hard use incident to an apparatus of this type.

It ismy purpose to construct a rotary harrow provided with triangular-shaped teeth in cross-section and arrange the draft appliance in relation to the harrow as will pull it forward from the rear rather than the front, so common with machines of this character now in use. I

The invention further comprehends improvements in the means employed for changing the speed of the harrow, such means being readily operable in a manner to be conevenint to the driver.

Other objects and advantages will be hereinafter referred to and be particularly pointed out in the claims.

In the drawings, Figure l is a perspective view of my improved harrow. Fig. 2 is a plan view of the same, the speed-regulator being shown in dotted lines to reduce the rotary speed of the cultivator. Fig. 3 is a central longitudinal section.

The numeral l indicates a harrow comprising a series of radial arms 2, clamped at their inner ends between two plates 3 and A, fastening devices passing through the plates and the arms. Fastened to the arms and extending downwardly are teeth 5, which are triangular in cross section, to provide cutting edges 6, and around the top of the frame is a track 7. A post S extends up from the center of the plate 4, and mounted thereon is a beam 9. The beam 9 is held on the post by any well-known securing means 10, and the post is free to turn. A hub Il spaces the beam from the plate 4, and secured to the beam adjacent the hub is a depending antifriction-roller 12, which bears on the top of plate 4, as shown. This roller relieves the post of the weight of the machine to permit the parts to turn freely.

To one side of the beam is fastened a plate l having ears 14, between which is pivoted by a pin 15 a bar 16, the outer end carrying a roller 17, which bears on the track 7. A chain 19 is secured at one end 20 to the side and near the front of the beam and at its opposite end 2l to the side and near the rear of said beam. The bar 16 has a hook 22, and this hook is designed to engage a link of the chain, as clearly shown.

It will be noted that the bar 16 is positioned to one side of the center of the harrow, which permits me to alter the speed of the harrow. I accomplish this result vby altering the posi.- tion of the roller 17 with. reference to the track. By moving the rod and its roller toward the rear the rotary movement of the harrow is reduced, while if the rod and roller are moved toward the front the rotary movement of the harrow will be increased.

At a point near the front of the beam are I ears 25, having a series of registering perforations 26, while to the rear of the beam is secured a slightly bow-shaped draft-bar 27, formed with a slot 28 where it passes between the ears 25, and at its extreme front end said. bar has ears 29, between which is secured the swingletree 30. A pin 31 passes through the perforations 26 and slot 28 to holdthe draftbar in proper relative position.

The object in arranging the draft-bar as described is to exert a pushing action to the harrow to effectively cause the harrow to take into the earth and at the same time exert pressure on the roller 17 to create friction suflicient to cause the harrow to revolve.

The bow-shaped draft-b ar will give slightly as the harrow passes over unequal ground, the movement being permitted by the slotted connection with the ears at the front of the beam, so that all undue strain on the parts and pulling on the animals while the harrow is in transit are reduced to a minimum.

By providing the triangular teeth the soil is sure to be out up as the harrow revolves, which renders the apparatus more effective.

My invention is extremely simple in construction and can easily be operated.

lVhat I claim as new isl. In combination, a beam, a rotary harrow pivotally mounted on the beam, a bowshaped draft-bar connected to the rear end of the beam, a slot being formed in the bowshaped draft-bar, ears on the beam, and a fas- IOO tening passing through perforations formed in the ears and the slot in the bow-shaped draft-bar, substantially as described.

2. In combination, a beam, a rotary harrow pivotaily mounted on the beam, a track on the harrow, a bar piVotaHy mounted on the beam, and extending outwardly therefrom, a roller on the outer end of the bar to engage the track, a chain connected to the opposite ends of the beam and engaging the bar, a bow-shaped draft-bar secured to the rear of the beam, ears formed with perforations and a fastening device passing through the perforated ears and a slot formed in the draft-bar, substantially as described.

In testimony whereof I have affixed my signature in presence of two subscribing Witnesses.

ORISON SMITH. Vitnesses:

WILL A. BLANCHARD, F. S. STEWART. 

